OpenAI releases GPT-5.1
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GPT-5.1 released — the GPT-5 series updated with two models, GPT-5.1 Instant and GPT-5.1 Thinking
Why it matters
OpenAI said Thinking adapts its thinking time more dynamically, roughly twice as fast on the fastest tasks and twice as slow on the slowest, and that the name reflects an iterative upgrade within the GPT-5 generation
Source — Primary sources first; secondary reports are labelled “Press”
Officialopenai.comhttps://openai.com/index/gpt-5-1/Added in Week 41, 2026 · See that week
On the map — ⑥ Reasoning Models line
- Previous stopClaude Haiku 4.5
- This recordGPT-5.1
- Next stopClaude Opus 4.5
In the model family tree — GPT family · 23 versions
- Earlier versionGPT-5
- This recordGPT-5.1
- Later versionGPT-5.2